Balancing mechanism for scales.



P. F. HAZEN. BALANCING MECHANISM FOR SCALES. APPLICATION FILED IAN. 31, 1914.

1,115,931. Patented Nov.3, 1914.

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fw @@wy Q@ P. F. HAZEN.

BALANGING MEGHANISM PoR SCALES'.

APPLIGATION FILED JAN,31,19121.

1,115,931, Patented 0v.3, 1914.

2 SHEETS-SHEET 2.

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' ence to large hopper scales such as are used STATES Parana OFFICE.

PERLEY F. HAZEN, 0F ST. JOHNSBURY, VER-MONT, ASSIGNOR T0 E. AND T. FAIRBANK AND COMFANY, 0F ST. JOHNSBURY, VERMONT, A CORPORATION 0F VERMONT.

BALANCING MECHANISM ron SCALES.

To all ulmm 'it may concern lle it known that I, PERLEY F. HAZEN, a citizen of the United States of America, r'e siding at St. Johnsburv, in the county of Caledonia and State o Vermont, have invented certain new and useful Improvements in Balancing Mechanism for Scales, of which the following is a specification, retU erenee being had therein to'the accompany ing drawings.

The invention has more particularreferin the Weighin of grain and of a type in which the weig ts are carried by a counterpoise. In operation it is necessary to test the accuracy of the scale by restoring the same to balance after the weighing of each draft, which is usually accom lished by the removal of the detachable weights from the counterpoise. This involves considerable labor on the part of the attendant and also a loss of valuable time.

It is the object of the present invention to provide a simple means of quickly testing the balance of the scale with little e'ort on the part of the operator, and to this end the invention comprises the construction as here inafter set forth.

In the drawings: Flgure 1 1s a side elevation of the weighing beam and counterpoise of a scale to whleh my 1m rovement 1s apu plied; Fig. 2 is an end e evation thereof ;l

and Fig. 3 is a cross section.

A is thev Weighing beam, B the counterpoise and C the detachable weights applied to the oounterpoise.Y The counterpoise is normally supported upon the beam by the knife edge pivots D engaging bearings in the loop E. To avoid the necessity of removing the detachable weights I have provided an auxiliary counterweight F, Which is adapted to be supported upon pivots G on ,an extension H of the beam, through the medium of a loop'I similar in construction to the loop D. This auxiliary counterpoise is not, however, 4normally upon the pivots G, but is suspended from a rock arm or lever J which engages an upwardv extension K of the loop I. The lever J is fulcrumed upon a 4stationary support L and is provided with an 'oppositely-extending arm which is adapted to engage acorresponding extension K on the loo E. The arrangement is such that by roc (ing the lever J, the loop E will be lifted so las to Withdraw the Specication o! Letters Patent. Application led January 31., 1914. Serial N o. 815,794.

Patented N ov. 3, 1914.

l same from bearing upon the pivots D, while this movement will also lower the link I and permlt the same to engage the pivots G, thereby supporting the counterpoise F from the beam. As the counterpoise F will eX- actly balance the beam when no load is upon the scale, it is obvious that by thus rocking the lever J the weighted counterpoise'will be thrown out of action :1nd 'the iflnwelghted cmmterpoise substituted there- To lessen the labor otrockingie liever J, I preferably provide an o eraing meuhanism, such as a hand-wheel Ilil for rotating a Worm N, engaging a Worm segment O connected with the lever. The distance which the counterpoise and Weights must be lifted is comparatively slglul and therefore a few revolutions of the 'hand wheel will produce the desired effect Without muscular eliort on the part of the operator.

With the construction as described, after each draft of grain has been weighed, operator byrotating the hand-Wheel M lifts the counterpoise B and lowers the counter# poise F into engagement with the beam. I f the latter is in balance a. reverse'movnient of the handle M will restore the parts to normal position in which the sca-le is ready for the weighing of another draft.

What I claim as my invention is,--

l. In a scale, the combination with a weighing beam and a counterpoise'lerefor provided with detachable weights, of an unweighted counhorpeee, and means common to both counte'qmses for alternatively exchanging the engagement of the same with the beam.

2. In a scale, the combination with a weighing beam, a counterpoise therefor and. detachable weights engaging said counterpoise. of a substitute counterpoise normally out of connection with the beam,fand a single. means for lifting the first-mentioned counterpoise out of engagement with the beam and for lowering the Second-mentioned eounterpoise into engagement therewith.

3. In a scale, the combination with a beam, a counterpoise and detachable weight-s carried by said counterpois'e, of a substitut-e counterpoise, and a common means for alternatively lifting said counterpoises to substitute one for the other.

4. In a scale, the combination with a weighing beam, a counternnise therefor and detachable weights for engaging said counl of a terpoise, of a substitute eounterpoise, a loop for suspending each eounterpoise from the beam, and a means operatively connected to both loops for alternatively lifting the same to withdraw them from engagement with the beam.

5. In a scale, the combination with a weighing beam having an extension, of a eounterpoise therefor, detachable weights for engaging said counterpoise, a substitute eounterpoise adapted for engagement with the extension of the beam, a loop for each eounterpoise embracing the beam,knifeedge pivots for supporting said loops from` the beam, and means operatively connected with the loops for alternatively lifting them to withdraw the same from engagement with said knife-edge pivots.

6. YIn a scale, the combination with a Weighing beam provided. with an extension, of a eounterpoise therefor, detachable weights for engaging said eolmterpoise, a substitute eonnterpoise attached for engagf.L ment with the extension of said beam, a loop for suspending each eounterpoise from the beam provided with slotted pivot-engaging portions and an extension above the beam, knife-edge pivots engaging said slotted portions` and a. rock-able member for alternatively engaging the upward extensions of said loops to lift the same out of engagement with Said pivots.

7. In a scale, the combination with a weighing beam provided with an extension,

counterpoise therefor, detachable weights for said counterpoise, a substitute eounterpois: adapted for engagement with the extension of the beam, a loop for each eounterpoise embracing the beam, pivots for supporting said loops upon the beam, a roekable lever having oppositely extending portions for engaging-said loops, and. a worm gear operating mechanism for rocking Said lever to alternatively lift said loops to substitute one connterpoise for the other.

8. ln a scale,v the combination with a weighing beam provided with knife edges, and a weighted eounterpoise, of an nnweighted eounterpoise, connections between the eonnterpoises and the knife edges on the beam, and a means common to both counterpoises for alternately applying the same to the knife edges.

9. ln a scale, the combination with a weighing beam having an extension profill-eil with knife edge pivots, and a counterpoise for the beam provided with detachable weights, of an unweighted eonnterpoia` for the beam` link connections between the counterpoises and the knife edge pivots, and a- `rock lever for alternately exchanging the application or the counterpoises to the beam.

ln testimony whereof I aflix my signature in presence of two witnesses.

PERLEY F. HAZEN.

Witnesses JOHN C. CLARK, FRED C. BECK. 

